14193549836

Committed 01 Apr 2025 10:40AM UTC coverage: 69.046% (+0.007%) from 69.039%

Build # 14193549836

Build Type

Pull #9665

github

Committed by

web-flow

Commit Message

Merge e8825f209 into b01f4e514

Pull Request Pull Request #9665: kvdb: bump etcd libs to v3.5.12

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85.05

/routing/bandwidth.go

package routing

import (
        "fmt"

        "github.com/lightningnetwork/lnd/fn/v2"
        graphdb "github.com/lightningnetwork/lnd/graph/db"
        "github.com/lightningnetwork/lnd/htlcswitch"
        "github.com/lightningnetwork/lnd/lnwire"
        "github.com/lightningnetwork/lnd/routing/route"
        "github.com/lightningnetwork/lnd/tlv"
)

// bandwidthHints provides hints about the currently available balance in our
// channels.
type bandwidthHints interface {
        // availableChanBandwidth returns the total available bandwidth for a
        // channel and a bool indicating whether the channel hint was found.
        // The amount parameter is used to validate the outgoing htlc amount
        // that we wish to add to the channel against its flow restrictions. If
        // a zero amount is provided, the minimum htlc value for the channel
        // will be used. If the channel is unavailable, a zero amount is
        // returned.
        availableChanBandwidth(channelID uint64,
                amount lnwire.MilliSatoshi) (lnwire.MilliSatoshi, bool)

        // firstHopCustomBlob returns the custom blob for the first hop of the
        // payment, if available.
        firstHopCustomBlob() fn.Option[tlv.Blob]
}

// getLinkQuery is the function signature used to lookup a link.
type getLinkQuery func(lnwire.ShortChannelID) (
        htlcswitch.ChannelLink, error)

// bandwidthManager is an implementation of the bandwidthHints interface which
// uses the link lookup provided to query the link for our latest local channel
// balances.
type bandwidthManager struct {
        getLink       getLinkQuery
        localChans    map[lnwire.ShortChannelID]struct{}
        firstHopBlob  fn.Option[tlv.Blob]
        trafficShaper fn.Option[htlcswitch.AuxTrafficShaper]
}

// newBandwidthManager creates a bandwidth manager for the source node provided
// which is used to obtain hints from the lower layer w.r.t the available
// bandwidth of edges on the network. Currently, we'll only obtain bandwidth
// hints for the edges we directly have open ourselves. Obtaining these hints
// allows us to reduce the number of extraneous attempts as we can skip channels
// that are inactive, or just don't have enough bandwidth to carry the payment.
func newBandwidthManager(graph Graph, sourceNode route.Vertex,
        linkQuery getLinkQuery, firstHopBlob fn.Option[tlv.Blob],
        ts fn.Option[htlcswitch.AuxTrafficShaper]) (*bandwidthManager,
        error) {

        manager := &bandwidthManager{
                getLink:       linkQuery,
                localChans:    make(map[lnwire.ShortChannelID]struct{}),
                firstHopBlob:  firstHopBlob,
                trafficShaper: ts,
        }

        // First, we'll collect the set of outbound edges from the target
        // source node and add them to our bandwidth manager's map of channels.
        err := graph.ForEachNodeDirectedChannel(sourceNode,
                func(channel *graphdb.DirectedChannel) error {
                        shortID := lnwire.NewShortChanIDFromInt(
                                channel.ChannelID,
                        )
                        manager.localChans[shortID] = struct{}{}

                        return nil
                })

        if err != nil {
                return nil, err
        }

        return manager, nil
}

// getBandwidth queries the current state of a link and gets its currently
// available bandwidth. Note that this function assumes that the channel being
// queried is one of our local channels, so any failure to retrieve the link
// is interpreted as the link being offline.
func (b *bandwidthManager) getBandwidth(cid lnwire.ShortChannelID,
        amount lnwire.MilliSatoshi) lnwire.MilliSatoshi {

        link, err := b.getLink(cid)
        if err != nil {
                // If the link isn't online, then we'll report that it has
                // zero bandwidth.
                log.Warnf("ShortChannelID=%v: link not found: %v", cid, err)
                return 0
        }

        // If the link is found within the switch, but it isn't yet eligible
        // to forward any HTLCs, then we'll treat it as if it isn't online in
        // the first place.
        if !link.EligibleToForward() {
                log.Warnf("ShortChannelID=%v: not eligible to forward", cid)
                return 0
        }

        // bandwidthResult is an inline type that we'll use to pass the
        // bandwidth result from the external traffic shaper to the main logic
        // below.
        type bandwidthResult struct {
                // bandwidth is the available bandwidth for the channel as
                // reported by the external traffic shaper. If the external
                // traffic shaper is not handling the channel, this value will
                // be fn.None
                bandwidth fn.Option[lnwire.MilliSatoshi]

                // htlcAmount is the amount we're going to use to check if we
                // can add another HTLC to the channel. If the external traffic
                // shaper is handling the channel, we'll use 0 to just sanity
                // check the number of HTLCs on the channel, since we don't know
                // the actual HTLC amount that will be sent.
                htlcAmount fn.Option[lnwire.MilliSatoshi]
        }

        var (
                // We will pass the link bandwidth to the external traffic
                // shaper. This is the current best estimate for the available
                // bandwidth for the link.
                linkBandwidth = link.Bandwidth()

                bandwidthErr = func(err error) fn.Result[bandwidthResult] {
                        return fn.Err[bandwidthResult](err)
                }
        )

        result, err := fn.MapOptionZ(
                b.trafficShaper,
                func(s htlcswitch.AuxTrafficShaper) fn.Result[bandwidthResult] {
                        auxBandwidth, err := link.AuxBandwidth(
                                amount, cid, b.firstHopBlob, s,
                        ).Unpack()
                        if err != nil {
                                return bandwidthErr(fmt.Errorf("failed to get "+
                                        "auxiliary bandwidth: %w", err))
                        }

                        // If the external traffic shaper is not handling the
                        // channel, we'll just return the original bandwidth and
                        // no custom amount.
                        if !auxBandwidth.IsHandled {
                                return fn.Ok(bandwidthResult{})
                        }

                        // We don't know the actual HTLC amount that will be
                        // sent using the custom channel. But we'll still want
                        // to make sure we can add another HTLC, using the
                        // MayAddOutgoingHtlc method below. Passing 0 into that
                        // method will use the minimum HTLC value for the
                        // channel, which is okay to just check we don't exceed
                        // the max number of HTLCs on the channel. A proper
                        // balance check is done elsewhere.
                        return fn.Ok(bandwidthResult{
                                bandwidth:  auxBandwidth.Bandwidth,
                                htlcAmount: fn.Some[lnwire.MilliSatoshi](0),
                        })
                },
        ).Unpack()
        if err != nil {
                log.Errorf("ShortChannelID=%v: failed to get bandwidth from "+
                        "external traffic shaper: %v", cid, err)

                return 0
        }

        htlcAmount := result.htlcAmount.UnwrapOr(amount)

        // If our link isn't currently in a state where it can add another
        // outgoing htlc, treat the link as unusable.
        if err := link.MayAddOutgoingHtlc(htlcAmount); err != nil {
                log.Warnf("ShortChannelID=%v: cannot add outgoing "+
                        "htlc with amount %v: %v", cid, htlcAmount, err)
                return 0
        }

        // If the external traffic shaper determined the bandwidth, we'll return
        // that value, even if it is zero (which would mean no bandwidth is
        // available on that channel).
        reportedBandwidth := result.bandwidth.UnwrapOr(linkBandwidth)

        return reportedBandwidth
}

// availableChanBandwidth returns the total available bandwidth for a channel
// and a bool indicating whether the channel hint was found. If the channel is
// unavailable, a zero amount is returned.
func (b *bandwidthManager) availableChanBandwidth(channelID uint64,
        amount lnwire.MilliSatoshi) (lnwire.MilliSatoshi, bool) {

        shortID := lnwire.NewShortChanIDFromInt(channelID)
        _, ok := b.localChans[shortID]
        if !ok {
                return 0, false
        }

        return b.getBandwidth(shortID, amount), true
}

// firstHopCustomBlob returns the custom blob for the first hop of the payment,
// if available.
func (b *bandwidthManager) firstHopCustomBlob() fn.Option[tlv.Blob] {
        return b.firstHopBlob
}

1	package routing
2
3	import (
4	"fmt"
5
6	"github.com/lightningnetwork/lnd/fn/v2"
7	graphdb "github.com/lightningnetwork/lnd/graph/db"
8	"github.com/lightningnetwork/lnd/htlcswitch"
9	"github.com/lightningnetwork/lnd/lnwire"
10	"github.com/lightningnetwork/lnd/routing/route"
11	"github.com/lightningnetwork/lnd/tlv"
12	)
13
14	// bandwidthHints provides hints about the currently available balance in our
15	// channels.
16	type bandwidthHints interface {
17	// availableChanBandwidth returns the total available bandwidth for a
18	// channel and a bool indicating whether the channel hint was found.
19	// The amount parameter is used to validate the outgoing htlc amount
20	// that we wish to add to the channel against its flow restrictions. If
21	// a zero amount is provided, the minimum htlc value for the channel
22	// will be used. If the channel is unavailable, a zero amount is
23	// returned.
24	availableChanBandwidth(channelID uint64,
25	amount lnwire.MilliSatoshi) (lnwire.MilliSatoshi, bool)
26
27	// firstHopCustomBlob returns the custom blob for the first hop of the
28	// payment, if available.
29	firstHopCustomBlob() fn.Option[tlv.Blob]
30	}
31
32	// getLinkQuery is the function signature used to lookup a link.
33	type getLinkQuery func(lnwire.ShortChannelID) (
34	htlcswitch.ChannelLink, error)
35
36	// bandwidthManager is an implementation of the bandwidthHints interface which
37	// uses the link lookup provided to query the link for our latest local channel
38	// balances.
39	type bandwidthManager struct {
40	getLink getLinkQuery
41	localChans map[lnwire.ShortChannelID]struct{}
42	firstHopBlob fn.Option[tlv.Blob]
43	trafficShaper fn.Option[htlcswitch.AuxTrafficShaper]
44	}
45
46	// newBandwidthManager creates a bandwidth manager for the source node provided
47	// which is used to obtain hints from the lower layer w.r.t the available
48	// bandwidth of edges on the network. Currently, we'll only obtain bandwidth
49	// hints for the edges we directly have open ourselves. Obtaining these hints
50	// allows us to reduce the number of extraneous attempts as we can skip channels
51	// that are inactive, or just don't have enough bandwidth to carry the payment.
52	func newBandwidthManager(graph Graph, sourceNode route.Vertex,
53	linkQuery getLinkQuery, firstHopBlob fn.Option[tlv.Blob],
54	ts fn.Option[htlcswitch.AuxTrafficShaper]) (*bandwidthManager,
55	error) {	45✔
56		45✔
57	manager := &bandwidthManager{	45✔
58	getLink: linkQuery,	45✔
59	localChans: make(map[lnwire.ShortChannelID]struct{}),	45✔
60	firstHopBlob: firstHopBlob,	45✔
61	trafficShaper: ts,	45✔
62	}	45✔
63		45✔
64	// First, we'll collect the set of outbound edges from the target	45✔
65	// source node and add them to our bandwidth manager's map of channels.	45✔
66	err := graph.ForEachNodeDirectedChannel(sourceNode,	45✔
67	func(channel *graphdb.DirectedChannel) error {	189✔
68	shortID := lnwire.NewShortChanIDFromInt(	144✔
69	channel.ChannelID,	144✔
70	)	144✔
71	manager.localChans[shortID] = struct{}{}	144✔
72		144✔
73	return nil	144✔
74	})	144✔
75
76	if err != nil {	45✔
77	return nil, err	×
78	}	×
79
80	return manager, nil	45✔
81	}
82
83	// getBandwidth queries the current state of a link and gets its currently
84	// available bandwidth. Note that this function assumes that the channel being
85	// queried is one of our local channels, so any failure to retrieve the link
86	// is interpreted as the link being offline.
87	func (b *bandwidthManager) getBandwidth(cid lnwire.ShortChannelID,
88	amount lnwire.MilliSatoshi) lnwire.MilliSatoshi {	146✔
89		146✔
90	link, err := b.getLink(cid)	146✔
91	if err != nil {	150✔
92	// If the link isn't online, then we'll report that it has	4✔
93	// zero bandwidth.	4✔
94	log.Warnf("ShortChannelID=%v: link not found: %v", cid, err)	4✔
95	return 0	4✔
96	}	4✔
97
98	// If the link is found within the switch, but it isn't yet eligible
99	// to forward any HTLCs, then we'll treat it as if it isn't online in
100	// the first place.
101	if !link.EligibleToForward() {	149✔
102	log.Warnf("ShortChannelID=%v: not eligible to forward", cid)	4✔
103	return 0	4✔
104	}	4✔
105
106	// bandwidthResult is an inline type that we'll use to pass the
107	// bandwidth result from the external traffic shaper to the main logic
108	// below.
109	type bandwidthResult struct {	144✔
110	// bandwidth is the available bandwidth for the channel as	144✔
111	// reported by the external traffic shaper. If the external	144✔
112	// traffic shaper is not handling the channel, this value will	144✔
113	// be fn.None	144✔
114	bandwidth fn.Option[lnwire.MilliSatoshi]	144✔
115		144✔
116	// htlcAmount is the amount we're going to use to check if we	144✔
117	// can add another HTLC to the channel. If the external traffic	144✔
118	// shaper is handling the channel, we'll use 0 to just sanity	144✔
119	// check the number of HTLCs on the channel, since we don't know	144✔
120	// the actual HTLC amount that will be sent.	144✔
121	htlcAmount fn.Option[lnwire.MilliSatoshi]	144✔
122	}	144✔
123		144✔
124	var (	144✔
125	// We will pass the link bandwidth to the external traffic	144✔
126	// shaper. This is the current best estimate for the available	144✔
127	// bandwidth for the link.	144✔
128	linkBandwidth = link.Bandwidth()	144✔
129		144✔
130	bandwidthErr = func(err error) fn.Result[bandwidthResult] {	144✔
131	return fn.Err[bandwidthResult](err)	×
132	}	×
133	)
134
135	result, err := fn.MapOptionZ(	144✔
136	b.trafficShaper,	144✔
137	func(s htlcswitch.AuxTrafficShaper) fn.Result[bandwidthResult] {	285✔
138	auxBandwidth, err := link.AuxBandwidth(	141✔
139	amount, cid, b.firstHopBlob, s,	141✔
140	).Unpack()	141✔
141	if err != nil {	141✔
142	return bandwidthErr(fmt.Errorf("failed to get "+	×
143	"auxiliary bandwidth: %w", err))	×
144	}	×
145
146	// If the external traffic shaper is not handling the
147	// channel, we'll just return the original bandwidth and
148	// no custom amount.
149	if !auxBandwidth.IsHandled {	282✔
150	return fn.Ok(bandwidthResult{})	141✔
151	}	141✔
152
153	// We don't know the actual HTLC amount that will be
154	// sent using the custom channel. But we'll still want
155	// to make sure we can add another HTLC, using the
156	// MayAddOutgoingHtlc method below. Passing 0 into that
157	// method will use the minimum HTLC value for the
158	// channel, which is okay to just check we don't exceed
159	// the max number of HTLCs on the channel. A proper
160	// balance check is done elsewhere.
161	return fn.Ok(bandwidthResult{	×
162	bandwidth: auxBandwidth.Bandwidth,	×
163	htlcAmount: fn.Some[lnwire.MilliSatoshi](0),	×
164	})	×
165	},
166	).Unpack()
167	if err != nil {	144✔
168	log.Errorf("ShortChannelID=%v: failed to get bandwidth from "+	×
169	"external traffic shaper: %v", cid, err)	×
170		×
171	return 0	×
172	}	×
173
174	htlcAmount := result.htlcAmount.UnwrapOr(amount)	144✔
175		144✔
176	// If our link isn't currently in a state where it can add another	144✔
177	// outgoing htlc, treat the link as unusable.	144✔
178	if err := link.MayAddOutgoingHtlc(htlcAmount); err != nil {	148✔
179	log.Warnf("ShortChannelID=%v: cannot add outgoing "+	4✔
180	"htlc with amount %v: %v", cid, htlcAmount, err)	4✔
181	return 0	4✔
182	}	4✔
183
184	// If the external traffic shaper determined the bandwidth, we'll return
185	// that value, even if it is zero (which would mean no bandwidth is
186	// available on that channel).
187	reportedBandwidth := result.bandwidth.UnwrapOr(linkBandwidth)	143✔
188		143✔
189	return reportedBandwidth	143✔
190	}
191
192	// availableChanBandwidth returns the total available bandwidth for a channel
193	// and a bool indicating whether the channel hint was found. If the channel is
194	// unavailable, a zero amount is returned.
195	func (b *bandwidthManager) availableChanBandwidth(channelID uint64,
196	amount lnwire.MilliSatoshi) (lnwire.MilliSatoshi, bool) {	147✔
197		147✔
198	shortID := lnwire.NewShortChanIDFromInt(channelID)	147✔
199	_, ok := b.localChans[shortID]	147✔
200	if !ok {	148✔
201	return 0, false	1✔
202	}	1✔
203
204	return b.getBandwidth(shortID, amount), true	146✔
205	}
206
207	// firstHopCustomBlob returns the custom blob for the first hop of the payment,
208	// if available.
209	func (b *bandwidthManager) firstHopCustomBlob() fn.Option[tlv.Blob] {	39✔
210	return b.firstHopBlob	39✔
211	}	39✔

lightningnetwork / lnd / 14193549836

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